You can visit Weiße Rose Museum
Not the most student friendly as far as international non exchange students are concerned. The foreign office is chaotic, never open and their advice is not always correct as there is very little experience on how to deal with people that don't fit into the German box (of norms).
I visited the building as a tourist, I wanted to see where Sophie scholl threw her flyers before being arrested.
I visited this university as a tourist. The buildings are really nice and it seems good organised.
My opinion this is the best university